Enzymatic hydrolysis of pectin followed by ultrafiltration of hydrolysate was applied with the aim to produce fractions with potent antioxidant capacity. Pectin was isolated from waste sugar beet pulp by acidic extraction, washed by diafiltration and concentrated by ultrafiltration. Enzymatic hydrolysis was performed with endo-polygalacturonase, and hydrolysate was processed by ultrafiltration into four fractions using membranes in series of decreasing cut-offs from 10 to 1 kDa. Hydrolysis with endo-polygalacturonase increased total antioxidant capacity by twofold in comparison to un-hydrolyzed pectin. Antioxidant capacity of all fractions was considerably higher than that of pectin-from 14.7 to 25-fold, for fraction containing fragments 10 kDa > Mw > 5 kDa and Mw < 1 kDa, respectively. Considerable increase of total antioxidant capacity of pectin through the integration of enzymatic modification and ultrafiltration fractionation indicated great potential of applied green protocol for the production of high-value hydrolysates of pectin from waste sugar beet pulp.
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